TrailManor Owner's Forum - View Single Post - Anyone towing with GM 6-speed auto

04-19-2009, 06:55 PM

I have a 2008 GMC Sierra 2500HD long bed with the 6 speed, but it is a 6.0.

I also have a 2002 Chevy Silverado 1500HD standard bed (6.5 feet) with the 6.0 and the 4 speed transmission.

Can can not tell any difference due to the transmission.

Both are 4wd. The 2500 porpoises less when towing. I attribute that mostly to the longer wheel base.

I can tell you this from experience, when towing eastbound in the Sierras, when getting back onto the freeway, and the on ramp is uphill, and the elevation is above 6,000 feet, I can accelerate so that when I merge I am doing 55 mpg. When just towing on the freeway over Donner Summit, I can use cruise control all the way and maintain 55 mph, the state limit when towing. Any smaller motor may not do as well.

I would expect, however, that on flatter ground and/or at lower elevations the 5.3 would be fine.

I have never been to North Carolina (yet), but my memory from high school geography tells me that your elevations are a little lower that I commonly find in California, or others find in Colorado.

04-19-2009, 06:55 PM	#4
PopBeavers Guest Posts: n/a	I have a 2008 GMC Sierra 2500HD long bed with the 6 speed, but it is a 6.0. I also have a 2002 Chevy Silverado 1500HD standard bed (6.5 feet) with the 6.0 and the 4 speed transmission. Can can not tell any difference due to the transmission. Both are 4wd. The 2500 porpoises less when towing. I attribute that mostly to the longer wheel base. I can tell you this from experience, when towing eastbound in the Sierras, when getting back onto the freeway, and the on ramp is uphill, and the elevation is above 6,000 feet, I can accelerate so that when I merge I am doing 55 mpg. When just towing on the freeway over Donner Summit, I can use cruise control all the way and maintain 55 mph, the state limit when towing. Any smaller motor may not do as well. I would expect, however, that on flatter ground and/or at lower elevations the 5.3 would be fine. I have never been to North Carolina (yet), but my memory from high school geography tells me that your elevations are a little lower that I commonly find in California, or others find in Colorado.